Celestial hemisphere:  Northern  ·  Constellation: Vulpecula (Vul)  ·  Contains:  PK072-17.1
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Abell 74 Pn in Vulpecular HaRGB, Pat Rodgers
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Abell 74 Pn in Vulpecular HaRGB

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Abell 74 Pn in Vulpecular HaRGB, Pat Rodgers
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Abell 74 Pn in Vulpecular HaRGB

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Description

An ancient Planetary Nebula that has stretched to 15 light years across. This makes it very faint and given it's low altitude for me, it's a difficult object. A single sub in Ha barely registers an outline of Abell 74. OIII is non-existent, although I've seen an image which has some OIII present but that's from the Kit Peak 4m telescope in dark skies. RGB offers no structure.

Taken over several nights from the 18th August as it never gets out of the mirk and as it sinks lower the seeing gets worse. I go from 170 stars to 30 over a 600s sub.

Still pleased to eek out another off me Abell list.

Rev A: The RGB the small central star is visible just above the star in the centre of the image. It's the small blue star. The small galaxy around 1 o'clock inside Abell 74 is PGC66471.

Comments

Revisions

  • Abell 74 Pn in Vulpecular HaRGB, Pat Rodgers
    Original
  • Abell 74 Pn in Vulpecular HaRGB, Pat Rodgers
    B
  • Abell 74 Pn in Vulpecular HaRGB, Pat Rodgers
    C
  • Abell 74 Pn in Vulpecular HaRGB, Pat Rodgers
    D
  • Abell 74 Pn in Vulpecular HaRGB, Pat Rodgers
    E
  • Final
    Abell 74 Pn in Vulpecular HaRGB, Pat Rodgers
    F

B

Description: HaRGB a really stretched image. Increases the noise though :-(

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C

Description: HaGB.
As there is no nebula showing in the R filter I used the Ha as the red channel. A cheat in a way but there's nothing to subtract the two filters against each other. So maybe not cheating, just laziness.
As the Ha gives washed out stars I've replaced them with the stars from the RGB, Image A.

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D

Description: Got off me lazy chair and did a proper HaRGB. Was able to glean a tad more nebula.
I ran a search on Astrobin and this is the only image of it. Must be a bug.

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E

Description: A single Ha sub with a STF stretch applied showing how faint this one is.

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F

Description: Just a re-vamp of the old data. I used the NormalizeScaleGradient script on the registered files. There's a good review of the process on TheAstroImagingChannel, by Adam Block. Really helped with the mucky skies of my earlier processes. So cleaner image overall. Jerry Macon has a wonderful image of this difficult target.

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Abell 74 Pn in Vulpecular HaRGB, Pat Rodgers

In these public groups

UK Astro-Imaging